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Movement in Restructuring Provisions incl. Resource Rationalizations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Restructuring Reserve [Roll Forward]              
Beginning provision     $ 12,490        
Total provision recognized $ 12,490 $ 7,753 12,490 $ 7,753 $ 7,800   $ 8,800
Utilized     (490)        
Foreign exchange     0        
Closing provision 12,000   12,000   12,490    
Resource Rationalizations              
Restructuring Reserve [Roll Forward]              
Beginning provision     317 1,791 1,791    
Total provision recognized           $ 8,159  
Utilized     (310)   (1,474) (6,305)  
Foreign exchange           (63)  
Closing provision 7   7   317 1,791  
Workforce Reduction              
Restructuring Reserve [Roll Forward]              
Beginning provision     9,684        
Utilized     (490)        
Foreign exchange     0        
Closing provision 9,194   9,194   9,684    
Workforce Reduction | Resource Rationalizations              
Restructuring Reserve [Roll Forward]              
Beginning provision     0 393 393    
Total provision recognized           6,190  
Utilized     0   (393) (5,734)  
Foreign exchange           (63)  
Closing provision 0   0   0 393  
Onerous Lease              
Restructuring Reserve [Roll Forward]              
Beginning provision     2,806        
Utilized     0        
Foreign exchange     0        
Closing provision 2,806   2,806   2,806    
Onerous Lease | Resource Rationalizations              
Restructuring Reserve [Roll Forward]              
Beginning provision     317 $ 1,398 1,398    
Total provision recognized           1,969  
Utilized     (310)   (1,081) (571)  
Foreign exchange           0  
Closing provision $ 7   $ 7   $ 317 $ 1,398